Ever since AAP and Oreilly updated their websites, I find them somewhat cantankerous. Somewhat frustrating for me because I like to research what I want before I walk through the door.
Simple searches yield "no results found." Also, I sometimes have to click more than once to select something. On top of that, I may be going to a drop down menu and all the channels (add vehicle for example) and then I may just get kicked out and have to restart.
I've always considered NAPA's site to be somewhat of a pain, but it's not so bad now.. AZ's looks to be the same to me although I don't go there much.
Surely it's not just me? 
